mirror of
https://github.com/torvalds/linux.git
synced 2024-11-24 21:21:41 +00:00
iomap: move the swapfile code into a separate file
Move the swapfile activation code into a separate file so that we can group related functions in a single file instead of having a single enormous source file. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong
parent
1c230208f5
commit
a45c0eccc5
170
fs/iomap.c
170
fs/iomap.c
@ -2000,176 +2000,6 @@ out_free_dio:
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(iomap_dio_rw);
|
||||
|
||||
/* Swapfile activation */
|
||||
|
||||
#ifdef CONFIG_SWAP
|
||||
struct iomap_swapfile_info {
|
||||
struct iomap iomap; /* accumulated iomap */
|
||||
struct swap_info_struct *sis;
|
||||
uint64_t lowest_ppage; /* lowest physical addr seen (pages) */
|
||||
uint64_t highest_ppage; /* highest physical addr seen (pages) */
|
||||
unsigned long nr_pages; /* number of pages collected */
|
||||
int nr_extents; /* extent count */
|
||||
};
|
||||
|
||||
/*
|
||||
* Collect physical extents for this swap file. Physical extents reported to
|
||||
* the swap code must be trimmed to align to a page boundary. The logical
|
||||
* offset within the file is irrelevant since the swapfile code maps logical
|
||||
* page numbers of the swap device to the physical page-aligned extents.
|
||||
*/
|
||||
static int iomap_swapfile_add_extent(struct iomap_swapfile_info *isi)
|
||||
{
|
||||
struct iomap *iomap = &isi->iomap;
|
||||
unsigned long nr_pages;
|
||||
uint64_t first_ppage;
|
||||
uint64_t first_ppage_reported;
|
||||
uint64_t next_ppage;
|
||||
int error;
|
||||
|
||||
/*
|
||||
* Round the start up and the end down so that the physical
|
||||
* extent aligns to a page boundary.
|
||||
*/
|
||||
first_ppage = ALIGN(iomap->addr, PAGE_SIZE) >> PAGE_SHIFT;
|
||||
next_ppage = ALIGN_DOWN(iomap->addr + iomap->length, PAGE_SIZE) >>
|
||||
PAGE_SHIFT;
|
||||
|
||||
/* Skip too-short physical extents. */
|
||||
if (first_ppage >= next_ppage)
|
||||
return 0;
|
||||
nr_pages = next_ppage - first_ppage;
|
||||
|
||||
/*
|
||||
* Calculate how much swap space we're adding; the first page contains
|
||||
* the swap header and doesn't count. The mm still wants that first
|
||||
* page fed to add_swap_extent, however.
|
||||
*/
|
||||
first_ppage_reported = first_ppage;
|
||||
if (iomap->offset == 0)
|
||||
first_ppage_reported++;
|
||||
if (isi->lowest_ppage > first_ppage_reported)
|
||||
isi->lowest_ppage = first_ppage_reported;
|
||||
if (isi->highest_ppage < (next_ppage - 1))
|
||||
isi->highest_ppage = next_ppage - 1;
|
||||
|
||||
/* Add extent, set up for the next call. */
|
||||
error = add_swap_extent(isi->sis, isi->nr_pages, nr_pages, first_ppage);
|
||||
if (error < 0)
|
||||
return error;
|
||||
isi->nr_extents += error;
|
||||
isi->nr_pages += nr_pages;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Accumulate iomaps for this swap file. We have to accumulate iomaps because
|
||||
* swap only cares about contiguous page-aligned physical extents and makes no
|
||||
* distinction between written and unwritten extents.
|
||||
*/
|
||||
static loff_t iomap_swapfile_activate_actor(struct inode *inode, loff_t pos,
|
||||
loff_t count, void *data, struct iomap *iomap)
|
||||
{
|
||||
struct iomap_swapfile_info *isi = data;
|
||||
int error;
|
||||
|
||||
switch (iomap->type) {
|
||||
case IOMAP_MAPPED:
|
||||
case IOMAP_UNWRITTEN:
|
||||
/* Only real or unwritten extents. */
|
||||
break;
|
||||
case IOMAP_INLINE:
|
||||
/* No inline data. */
|
||||
pr_err("swapon: file is inline\n");
|
||||
return -EINVAL;
|
||||
default:
|
||||
pr_err("swapon: file has unallocated extents\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* No uncommitted metadata or shared blocks. */
|
||||
if (iomap->flags & IOMAP_F_DIRTY) {
|
||||
pr_err("swapon: file is not committed\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
if (iomap->flags & IOMAP_F_SHARED) {
|
||||
pr_err("swapon: file has shared extents\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* Only one bdev per swap file. */
|
||||
if (iomap->bdev != isi->sis->bdev) {
|
||||
pr_err("swapon: file is on multiple devices\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (isi->iomap.length == 0) {
|
||||
/* No accumulated extent, so just store it. */
|
||||
memcpy(&isi->iomap, iomap, sizeof(isi->iomap));
|
||||
} else if (isi->iomap.addr + isi->iomap.length == iomap->addr) {
|
||||
/* Append this to the accumulated extent. */
|
||||
isi->iomap.length += iomap->length;
|
||||
} else {
|
||||
/* Otherwise, add the retained iomap and store this one. */
|
||||
error = iomap_swapfile_add_extent(isi);
|
||||
if (error)
|
||||
return error;
|
||||
memcpy(&isi->iomap, iomap, sizeof(isi->iomap));
|
||||
}
|
||||
return count;
|
||||
}
|
||||
|
||||
/*
|
||||
* Iterate a swap file's iomaps to construct physical extents that can be
|
||||
* passed to the swapfile subsystem.
|
||||
*/
|
||||
int iomap_swapfile_activate(struct swap_info_struct *sis,
|
||||
struct file *swap_file, sector_t *pagespan,
|
||||
const struct iomap_ops *ops)
|
||||
{
|
||||
struct iomap_swapfile_info isi = {
|
||||
.sis = sis,
|
||||
.lowest_ppage = (sector_t)-1ULL,
|
||||
};
|
||||
struct address_space *mapping = swap_file->f_mapping;
|
||||
struct inode *inode = mapping->host;
|
||||
loff_t pos = 0;
|
||||
loff_t len = ALIGN_DOWN(i_size_read(inode), PAGE_SIZE);
|
||||
loff_t ret;
|
||||
|
||||
/*
|
||||
* Persist all file mapping metadata so that we won't have any
|
||||
* IOMAP_F_DIRTY iomaps.
|
||||
*/
|
||||
ret = vfs_fsync(swap_file, 1);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
while (len > 0) {
|
||||
ret = iomap_apply(inode, pos, len, IOMAP_REPORT,
|
||||
ops, &isi, iomap_swapfile_activate_actor);
|
||||
if (ret <= 0)
|
||||
return ret;
|
||||
|
||||
pos += ret;
|
||||
len -= ret;
|
||||
}
|
||||
|
||||
if (isi.iomap.length) {
|
||||
ret = iomap_swapfile_add_extent(&isi);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
*pagespan = 1 + isi.highest_ppage - isi.lowest_ppage;
|
||||
sis->max = isi.nr_pages;
|
||||
sis->pages = isi.nr_pages - 1;
|
||||
sis->highest_bit = isi.nr_pages - 1;
|
||||
return isi.nr_extents;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(iomap_swapfile_activate);
|
||||
#endif /* CONFIG_SWAP */
|
||||
|
||||
static loff_t
|
||||
iomap_bmap_actor(struct inode *inode, loff_t pos, loff_t length,
|
||||
void *data, struct iomap *iomap)
|
||||
|
||||
@ -3,3 +3,6 @@
|
||||
# Copyright (c) 2019 Oracle.
|
||||
# All Rights Reserved.
|
||||
#
|
||||
obj-$(CONFIG_FS_IOMAP) += iomap.o
|
||||
|
||||
iomap-$(CONFIG_SWAP) += swapfile.o
|
||||
|
||||
180
fs/iomap/swapfile.c
Normal file
180
fs/iomap/swapfile.c
Normal file
@ -0,0 +1,180 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
/*
|
||||
* Copyright (C) 2018 Oracle. All Rights Reserved.
|
||||
* Author: Darrick J. Wong <darrick.wong@oracle.com>
|
||||
*/
|
||||
#include <linux/module.h>
|
||||
#include <linux/compiler.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/iomap.h>
|
||||
#include <linux/swap.h>
|
||||
|
||||
#include "../internal.h"
|
||||
|
||||
/* Swapfile activation */
|
||||
|
||||
struct iomap_swapfile_info {
|
||||
struct iomap iomap; /* accumulated iomap */
|
||||
struct swap_info_struct *sis;
|
||||
uint64_t lowest_ppage; /* lowest physical addr seen (pages) */
|
||||
uint64_t highest_ppage; /* highest physical addr seen (pages) */
|
||||
unsigned long nr_pages; /* number of pages collected */
|
||||
int nr_extents; /* extent count */
|
||||
};
|
||||
|
||||
/*
|
||||
* Collect physical extents for this swap file. Physical extents reported to
|
||||
* the swap code must be trimmed to align to a page boundary. The logical
|
||||
* offset within the file is irrelevant since the swapfile code maps logical
|
||||
* page numbers of the swap device to the physical page-aligned extents.
|
||||
*/
|
||||
static int iomap_swapfile_add_extent(struct iomap_swapfile_info *isi)
|
||||
{
|
||||
struct iomap *iomap = &isi->iomap;
|
||||
unsigned long nr_pages;
|
||||
uint64_t first_ppage;
|
||||
uint64_t first_ppage_reported;
|
||||
uint64_t next_ppage;
|
||||
int error;
|
||||
|
||||
/*
|
||||
* Round the start up and the end down so that the physical
|
||||
* extent aligns to a page boundary.
|
||||
*/
|
||||
first_ppage = ALIGN(iomap->addr, PAGE_SIZE) >> PAGE_SHIFT;
|
||||
next_ppage = ALIGN_DOWN(iomap->addr + iomap->length, PAGE_SIZE) >>
|
||||
PAGE_SHIFT;
|
||||
|
||||
/* Skip too-short physical extents. */
|
||||
if (first_ppage >= next_ppage)
|
||||
return 0;
|
||||
nr_pages = next_ppage - first_ppage;
|
||||
|
||||
/*
|
||||
* Calculate how much swap space we're adding; the first page contains
|
||||
* the swap header and doesn't count. The mm still wants that first
|
||||
* page fed to add_swap_extent, however.
|
||||
*/
|
||||
first_ppage_reported = first_ppage;
|
||||
if (iomap->offset == 0)
|
||||
first_ppage_reported++;
|
||||
if (isi->lowest_ppage > first_ppage_reported)
|
||||
isi->lowest_ppage = first_ppage_reported;
|
||||
if (isi->highest_ppage < (next_ppage - 1))
|
||||
isi->highest_ppage = next_ppage - 1;
|
||||
|
||||
/* Add extent, set up for the next call. */
|
||||
error = add_swap_extent(isi->sis, isi->nr_pages, nr_pages, first_ppage);
|
||||
if (error < 0)
|
||||
return error;
|
||||
isi->nr_extents += error;
|
||||
isi->nr_pages += nr_pages;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Accumulate iomaps for this swap file. We have to accumulate iomaps because
|
||||
* swap only cares about contiguous page-aligned physical extents and makes no
|
||||
* distinction between written and unwritten extents.
|
||||
*/
|
||||
static loff_t iomap_swapfile_activate_actor(struct inode *inode, loff_t pos,
|
||||
loff_t count, void *data, struct iomap *iomap)
|
||||
{
|
||||
struct iomap_swapfile_info *isi = data;
|
||||
int error;
|
||||
|
||||
switch (iomap->type) {
|
||||
case IOMAP_MAPPED:
|
||||
case IOMAP_UNWRITTEN:
|
||||
/* Only real or unwritten extents. */
|
||||
break;
|
||||
case IOMAP_INLINE:
|
||||
/* No inline data. */
|
||||
pr_err("swapon: file is inline\n");
|
||||
return -EINVAL;
|
||||
default:
|
||||
pr_err("swapon: file has unallocated extents\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* No uncommitted metadata or shared blocks. */
|
||||
if (iomap->flags & IOMAP_F_DIRTY) {
|
||||
pr_err("swapon: file is not committed\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
if (iomap->flags & IOMAP_F_SHARED) {
|
||||
pr_err("swapon: file has shared extents\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* Only one bdev per swap file. */
|
||||
if (iomap->bdev != isi->sis->bdev) {
|
||||
pr_err("swapon: file is on multiple devices\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (isi->iomap.length == 0) {
|
||||
/* No accumulated extent, so just store it. */
|
||||
memcpy(&isi->iomap, iomap, sizeof(isi->iomap));
|
||||
} else if (isi->iomap.addr + isi->iomap.length == iomap->addr) {
|
||||
/* Append this to the accumulated extent. */
|
||||
isi->iomap.length += iomap->length;
|
||||
} else {
|
||||
/* Otherwise, add the retained iomap and store this one. */
|
||||
error = iomap_swapfile_add_extent(isi);
|
||||
if (error)
|
||||
return error;
|
||||
memcpy(&isi->iomap, iomap, sizeof(isi->iomap));
|
||||
}
|
||||
return count;
|
||||
}
|
||||
|
||||
/*
|
||||
* Iterate a swap file's iomaps to construct physical extents that can be
|
||||
* passed to the swapfile subsystem.
|
||||
*/
|
||||
int iomap_swapfile_activate(struct swap_info_struct *sis,
|
||||
struct file *swap_file, sector_t *pagespan,
|
||||
const struct iomap_ops *ops)
|
||||
{
|
||||
struct iomap_swapfile_info isi = {
|
||||
.sis = sis,
|
||||
.lowest_ppage = (sector_t)-1ULL,
|
||||
};
|
||||
struct address_space *mapping = swap_file->f_mapping;
|
||||
struct inode *inode = mapping->host;
|
||||
loff_t pos = 0;
|
||||
loff_t len = ALIGN_DOWN(i_size_read(inode), PAGE_SIZE);
|
||||
loff_t ret;
|
||||
|
||||
/*
|
||||
* Persist all file mapping metadata so that we won't have any
|
||||
* IOMAP_F_DIRTY iomaps.
|
||||
*/
|
||||
ret = vfs_fsync(swap_file, 1);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
while (len > 0) {
|
||||
ret = iomap_apply(inode, pos, len, IOMAP_REPORT,
|
||||
ops, &isi, iomap_swapfile_activate_actor);
|
||||
if (ret <= 0)
|
||||
return ret;
|
||||
|
||||
pos += ret;
|
||||
len -= ret;
|
||||
}
|
||||
|
||||
if (isi.iomap.length) {
|
||||
ret = iomap_swapfile_add_extent(&isi);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
*pagespan = 1 + isi.highest_ppage - isi.lowest_ppage;
|
||||
sis->max = isi.nr_pages;
|
||||
sis->pages = isi.nr_pages - 1;
|
||||
sis->highest_bit = isi.nr_pages - 1;
|
||||
return isi.nr_extents;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(iomap_swapfile_activate);
|
||||
Loading…
Reference in New Issue
Block a user